If we consider the moral principles and judgments to be based on real things and believe in an ethical system in accordance with the system of generation and in accordance with its current laws, then we have a reasonable moral system that we can discuss about it. But if we have a way other than this, in any way, that moral system loses its rationality and cannot be judged with the reason and thought on its principles. In the first case, we have a set of fixed, general, and permanent principles that are in line with objective and noumenal things, and in other words, we have an absolute moral system. Otherwise, the moral judgments are completely meaningless and unreasonable, or result from the individual and collective emotions and desires that lead to relativism in ethics. The discussion of the relationship between ought and is is oriented to the question as to whether it is possible to derive from the "is" and the facts, the "ought" and moral judgments, and justify them on the basis of "is"; or whether between these is an impermeable dam that make it impossible to establish any relation between them. In this research, we have reflected the views of the contemporary philosopher, Professor Mesbah Yazdi, and finally we came to the conclusion that he has chosen the first case and believes in the relationship between is and ought.
